i think the fact is that busiest cities in the united states rank higher. >> the mayor says it's time for a spring cleaning campaign. >> i think everybody will agree. there are favorite door doors we like people to see but we don't like the trash on the streets or graffiti. >> the mayor used to be the head of the department of public works charged with cleaning all that have stuff up. and now, by the way this survey taken from may through august of last rear but results were just published in an online magazine this month. live in san francisco, abc 7 news. >> okay. thank you. >> and there is a lot more still to come tonight here on abc 7 news at 6:00. just ahead a spectacular arrival of the space shuttle. it's piggy back ride to california and where to see it tomorrow. >> sand toys on steroids is how is described work going on at ocean beach in san francisco. and it's running awayed schedule. >> i'm sandhya patel. weekend is looking warmer. for the first weekend of fall. i'll have temperatures coming up. >> later tonight foster children find jobs. one pay joft of >>> welcome news for